Page 362 - Instant notes

Physical Chemistry 348

R−CO 2 −CH 3 2.1
R−CO−CH 3 2.2
−C≡CH 2.2
Ph−CH 3 2.3
R−O−CH 3 3.3

R−CO 2 −CH 3 3.7
R−OH ~4
−C=CH− 5.1
Ph−H 7.3
−CHO ~10
R−COOH ~12

fine structure splitting is determined by the spin-spin coupling constant, J, between the
two sets of non-equivalent magnetic nuclei. Spin-spin coupling constants are an intrinsic
property of the molecule and independent of the strength of the applied magnetic field.
The local magnetic field experienced by a single proton A, coupled to a single proton
B, is equal to the sum of the applied field, plus the perturbation due to

Fig. 2. The NMR spectrum of ethanol.
The protons giving rise to each group
of lines are indicated by underlining.
The cumulative integration of the